Since 2.82 my computer completely crash on random occasions
For me this sounds like your graphic card uses more power than the power adaptor can deliver. And then the system becomes unstable. This would fit to your new graphics card and the kernel power error, even when it started with Blender 2.82 first. Have you checked if your power adaptor can deliver enough power to the system?

To calculate how strong a power adaptor needs to be, calculate the maximum watt values for all of your components in your pc together, and add 10% to 20% on top to have some reserve. There are some small users that are usually not worth a mentioning. A ssd usually uses around 2 watt. Same goes for ram. But a motherboard comsumes easily around 50 watt nowadays.